Apparatus for concentrating, drying, and crystallizing.



M.. PRAGBR. Armguus r011 concnn'rmwme,

DRYING, AND GRYS'I ALLIZING.

APPLICATION FILED NOV. 22, 1912.

' Patented May 20, 1913.

, \IJM an "M- O O \k 9 Tu 0 o w. l l lhl 5 ..r (L no H h 4 \NveNToR R "Q AWH R N D R z mm T T m A M [ball whom, it may concern 7' tion, Serial Number 732998,; filed monrrrz rmenn, or BERLIN, GERMANY.

rrm'rus r03 co cnNrnA'rING, DRYING, AND caYs'rALmzINGa Be it known that I, MoRrrz PnAonml'sub- Berlin, Germany, have invented afnew and useful Apparatus for Concentrating, Drying, and Grystallizing; and I do hereby declare thev following to be a full, clean-and .exact description of the same.

This'mvention is an improvement in or modification of that setforth in my applica- Nov. 22, 1912, for Letters Patent in theUnited States of America, which is described an apparatus for concentrating drying orcrystallizing in stages, in which 1n a casin provided with a concentric stirring spind e,-are provided several'chambers arranged side by side,into which the material to be treated is introduced, treated by the stirring blades provided on the stirring spindle "and conveyed by means of scooping blades mounted on the said spindle, from one chamber into the next. There are, however, cases inwhich it'is not necessary to efi'ect concentration, drying or crys'tallizin in stages, but the materialtreated can be nished in a single operation, for instance when it is desired to treat lyes strongly precipitatingsalts, or of blades, each receives the prec1p1tated,-dr 1ed?or coneasily drying materials, easily concentrated liquids and the like. The apparatus accord ing to the above specification, is not suitable for such cases 1n practice, owing to the necessity of the passage of the material through'si'ngle chambers arranged side by side.

The present-invention relates to a further development of anapparatus described in the said specification, in such a manner that the casing subdivided in its lower part into a series of chambers arranged side by side, and provided with the concentric spindle carrying scooping "blades, is still retained, but the material is no longer conveyed from one chamber to the next by but the latter' are arranged so that centrated product contained in its ,chamber,

vided-with worm conveyers. I

The advantages of the apparatus ov er a I sin 1e drum receiving the whole of the materlal to be treated consist in the subedivided chambers treating at any. tlme compara- Specific ation of Letters Patent. Application filed November 22, 1912. Serial No. 752,999.

ject of the German Emperor, residing at the scooping I tively small quantities of the material inde-' pendently, for instance,

mixing and stirring 1t, so that a large area of treatment is obtained, without the apparatus becoming inany way more complicated than in the' case of a single working chamber, and without Patented May 20,1913.

the workingope'ration being in any way retarded thereby. 1 Moreover, .owing to the subdivision of the easing into several chambers arranged side by side in the lower half, and owing to the scooping blades adjoining closely the walls of the chambers, the chambers receiving only a comparatively small quantity of material, are completely cleaned during the repeated passage of the blades,

so that a permanent settling of concentrated, crystallized or 'dried material on the chamber walls is impossible. 'Finally, the singlechambers could also be heated-toa different degree, so that each chamber could supply a product of diflerent concentration and of different degree of drying. This is essential when for instance, it is not desired to utilize the wholeapparatus but only to treat comparatively small quantities of material, and when at the same time it is necessary to work with different speeds or with diflerent temperatures.

'A construction according to this. inven-,

tion is illustrated by way'of example in the accompanying drawing, in which:

Figure 1 shows it in longitudinal section, Fig. 2 bein'ga cross-section of the casing.

, The casing 1 which may work with a vacuum is sub-divided in the lower part into several adjoining chambers 2, 2, etc. These chambers are preferably made with double walls, thespace between the double walls being usedas a heating chamber. It will be seen that, owing to this division of the casing into several adjoining chambers, comparatively small single chamberswith large heating surface are "PIOVldGd for the treat ment so that the efficiency of the apparatr;

as regards the material discharged'is considerably increased.

I I I In the. casing 1 is concentrically mounted a and conveys it to-ad1scharge'conduit ar.? ranged above the stirrlnglsplndle and prospin'dle 3 which can be driven from an oscilher, the walls of. which'closely adjoin the walls of the single chambers '2, 2', etc. When the spindle is driven, the said blades pass through the chambers 2, sliding close to the Walls of the same, and take up the solid material contained in the chambers, for instance the precipitated salt, the material deprived of water, dried or concentrated, and discharge it at a suitable rotation in vertical or practically vertical position into a discharge conduit 6, in which is working a worm conveyer 7 which carries the material to the outlet funnel 8. The openings for the lye deprived of salt are marked 9, and those for supplying the lye to be treated, the liquid 'to be concentrated or the material to bedried, are marked 10. The spindle can be oscillated in such a manner that between each two consecutive oscillations, there will be a certain adjustable period of time, for instance, adjustable by the adjustment of a suitable gear controlled by a cam groove, but not shown here, as it is assumed to be well known..

If the movement of the spindle to about 270 were to make it difficult to arran e the stirring blades on the same, and in so in as the stirring of the material to be introduced is considered desirable, a separate stirring device could be provided, for instance consisting of a drum, the said rods being driven from an eccentric spindle situated outside the drum. It is moreover advisable to make the discharge conduit capable of being separately heated, in order to enable subsequent drying or concentration to be carried out therein.

Having new fully described the nature of my invention and in what manner the same is to be performed, I declare that what I claim and desire to secure by Letters Patent 1s:

1; In an apparatus for concentrating, drying, and crystallizing, a casing, transverse partitions forming chambers in the lower part thereof, a spindle rotating in said casing, scooping blades thereon, a discharge trough into which the scooping blades discharge the material, whereby the material in each chamber is treated independently.

2. In an apparatus for concentrating, dryin and crystallizing, a casing, transverse partitlons forming chambers in the lower part thereof, a spindle rotatingin said casing, scooping blades thereon, a discharge trough into which the scooping blades discharge the material, and a conveyer in said groove, whereby the material in each chamber is treated independently.

3. In an apparatus for concentrating, drying and crystallizing, a casing, transverse partitions forming chambers in the lower part thereof, a spindle rotating in said casing, scooping blades thereon adapted to pass very close to the walls of the chambers, a discharge trough, arranged above said spindle, into which the scooping blades discharge the material, whereby the material in each chamber is treated independently.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

' MORITZ PRAGER. Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

